Engraving machine attachment



June l2, 1956 G. cs.d GRUETTNER ENGRAVING MACHINE ATTACHMENT 3 Sheets-Sheet l Filed Nov. 13. 1952 93/ INVENTOR erkardruener BY 6 ATTORNEY June l2, 1956 G. G. GRUETTNER ENGRAVING MACHINE ATTACHMENT Filed NOV. 13, 1952 3 Sheets-Sheet 2 "z-rf! @L 86 8789 @i8 .1W-' f1 4 4 INVENTOR gerhard Qraefzer June 12, 1956 G. G. GRUETTNER 2,749,517

ENGRAVING MACHINE ATTACHMENT Filed Nov. l5. 1952 5 Sheets-Sheet 3 1 9 11' E' 6.0 64 7' 35 lead/ w\ 6/ 38 37118 59 626/ INVENTOR j ATTORNE;

United States Patent O ENGRAVING MACHINE ATTACHMENT Gerhard G. Gruettner, New York, N. Y., assignor to New Hermes Ring Engraving Corp., New York, N. Y., a corporation of New York Application November 13, 1952, Serial No. 320,270

1 Claim. (Cl. 153-25) This invention refers to engraving machines and more particularly to engraving machines for engraving internal surfaces of annular objects, and more particularly for engraving rings.

My invention relates to improvements of my joint invention set forth in Patent No. 2,562,269, granted July 3l, 1951, and contnues-in-part my invention described and claimed in my application Serial No. 194,163, tiled November 4, 1950.

Ny invention is particularly concerned in embodying improvements in an engraving or copying machine characterized by having a base, a Workholder support and an indicia holder, and a support on which pivot means carry a pantographic tracer arm assembly as set forth in my application aforesaid for pivotal movement about an axis extending horizontally and having an engravingy tool to position the workholder support in a plane common to the center line of the pivot mounting means for the pantographic assembly whereby, Without altering the work in the workholder, a change in ratio between the indicia or master letters and that to be reproduced or engraved on the work may be effected.

My invention more particularly resides in providing a novel arrangement whereby annular objects may be engraved internally with the foregoing assembly, and par ticularly to provide an engraving assembly for engraving the internal surface of finger rings, and still more particularly without removing the work from the holder.

Still more particularly it is an object of my invention to provide a novel combination for engraving iinger rings by the employment of my engraving machines, employing a pantographic tracer arm assembly normally adapted for engraving iiat work and the external surfaces of trophies, thereby to increase the utility of such engraving machines in the fields where the internal surfaces of such annulae as rings may be engraved.

To attain these objects and such further objects as may appear herein or be hereinafter pointed out, I make reference to the accompanying drawing, forming a part hereof, in which- Figure 1 is a plan view showing an assembly in accordance with my invention;

Figure 2 is a magnied sectional View taken on the line 2 2 of Figure l;

Figure 3 is a side elevation of the assembly shown in Figure l;

Figure 4 is a fragmentary magnified section taken on the line 4 4 of Figure 5 Figure 5 is a fragmentary magnified detail of the engraving tool holder;

Figure 6 is a magnified section taken on the line 6-6 of Figure 3;

Figure 7 is a section taken on the line 7-7 of Figure 8;

Figure 8 is a section taken on the line 8-8 of Figure 3;

Figure 9 is a section taken on the line 9 9- of Figure 7.

Making reference to the drawing, there is shown an engraving machine 10 having a base 11, to one side of which is a standard 12 on which is positioned a support Patented June 12, 1956 ICC 13 extending from the pivots 14, the axis of which is hori- Zontally extended. The horizontally pivotal support may follow the construction of my Patent No. 2,481,658 of September 13, 1949, or that more particularly shown in my pending application above mentioned, to provide extended from said horizontal pvot support, pivot means 15 carrying a pantographic assembly 16. The details of the pantograph tracer arm assembly which i prefer are more particularly described in my application aforementioned.

The base 11 has in opposed position to the standard 12 an indicia holder standard 17 upon which is mounted an indicia holder channel 18, along which master indicia may be mounted. In accordance with my invention l provide an indicia holder I, the details of which I will describe more fully as this description proceeds.

Between the standards 12 and 17 I provide a workholder support standard 19, having at one end a post 20 fitting within the socket 21 axially to center the work holding standard 19 in a plane common to the pivot means 15 for the pantographic tracer arm assembly 16. A set screw 22, having a knob 23, extends through the boss 24 to bind the post 20 and hold the same against relative `rotation iixedly to position the workholder standard 19. The workholder support standard 19 is formed with a socket 25, axially to support the workholder W, which has a stem 26 extending into the socket 25. A knob controlled set screw shaft 27 is threadedly directed through the workholder support standard 19 into the path of the socket 25, to engage the stern 26 and hold the workholder W against relative rotation.

The workholder W is more specifically shown in Figures 6, 7 and 8 and includes a bracket 28, having a base plate 29 through which a threaded lug 30, extending from the stem 26, passes. A nut 3l threadedly engaging `the lug 30 bolts the stem and base plate to each other. The base plate 29 has extended therefrom a vertically directed web 32, upon which is positioned the ring chuck 33. This ring chuck comprises a co-axially positioned and mounted chuck plate 34 and chucking gear 35 supported on the shaft 36, which extends through the bearing 3'7 on the web 32. The shaft 36 has keyed to it the ratchet wheel 3S, carried by the collar 39, through which a set screw 40 passes, to key the ratchet wheel and collar to the shaft 35.

To one side of the ratchet wheel 33 there is pivotally mounted an indexing lever arm 41, pivoted at one end upon the shaft 42, extending through :the web 32. The indexing lever arm 41 carries a pivotal pawl 43 whose toothed end 44 engages the teeth of the ratchet wheel at one end. A spring 45 resiliently engages the branch 46 of the pawl 43, at its free end. A coiled spring 47 is anchored at one end to a pin 48 on the web 32. The opposite end of the spring 47 engages a pin 49 on the lever arm 41.

Upward spring movement is stopped by a lug 5t) which is mounted for adjustment eccentrically and screw threaded at 51 in the web 32, in the path of the pawl 43, where it may encounter the neck 52 of the pawl 43, variably to determine within limits the upward pivotal movement of the indexing lever as the pawl engages the ratchet wheel teeth. Predetermined throw of the lever downwardly is determined by the plate 53, having a shoulder 54 in the path of the indexing lever.

Superimposed on the shaft 42 adjacent the pivot point of the indexing lever is a spring biased locking pawl 55, whose tooth 56 is urged by the spring 57 into engagement with the ratchet wheel teeth. It will thus be seen that the wedging action of the tooth 44 between the ratchet wheel and lug 50 restrains movement of the ratchet wheel and the shaft it carries in one direction, while the pawl 55 restrains movement in the opposite direction.

A control knob 58, extending to one side of the web 32,

may be conveniently employed to index the ratchet wheel one tooth at a time, thereby to turn the shaft 36 and the assembly mounted thereon.

The chuck plate 34 is provided with a plurality of slides 59, guided in dove-tail slots radially extending on the chuck plate. The slides 59 carry forwardly ring engaging fingers 61 having peripheral V-shaped grooves 62. The slides S9 each have pins 63 directed rearwardly through radial slots 64 formed in the chuck plate and entering through such slots the spiral groove 65 formed in the face of the chucking gear 35. The chucking gear is driven by the sprocket 66 mounted on the shaft 42 and keyed therewith, and extending forwardly of the ring chuck at right angles to the web 32.

By the construction described, a workholder for finger rings is provided substantially co-axially to hold the ring with the shaft 36 by the relative movement of the fingers 61 to each other when driving the chuck gear through the medium of the shaft 42, there being provided a turnknob 67 to effect this driving movement,

The ring R or any similar annulus may thereby be presented for engraving work substantially coaxially with the shaft 36, the V-shaped grooves 62 centering the ring in a vertical plane co-axially with the center of the stem 26 of the workholder.

Referring now to Figures l to 3, the pantograph assembly 16 has a tool holding pressure arm 68 extending therefrom and terminates in a pressure knob 69 to manipulate the assembly carrying the engraving tool holder 70 in a manner well understood. The arm 68, for this purpose, carries the tool holder block 71 having a guide lug 72, which extends into a guide slot 73, formed along the length of the arm 68. A thumb screw 74 and washer extend from the lug and span the slot 73 to lock the block 71 in any position along the arm 68, there being provided a pointer 7S and a reference indicia scale 76 to act as a guide with regard to ratio changing adjustments of the multi-ratio pantographic assembly 16, where this type of assembly is used. It will be understood that where a fixed ratio pantographic assembly in accordance with my Patent No. 2,481,65 8 is employed, the adjustable mounting for the block 71 need not be employed.

The block 71 is extended therefrom by the tool holder post 77, one end 78 whereof being rotatably adjustable by release of the set screw 79. The free end 80 of the tool post 77 adjustably supports cross arm 81 in a guide boring 82 and is held in any predetermined position by the set screws 83. The free end of the cross arm 81 carries an engraving tool 84 in removable position by the set screws 85. The engraving tool l have found useful is described and disclosed in United States Patent No. 2,557,148.

In accordance with the foregoing construction, the cross arm 81 may be longitudinally adjusted with respect to the arm 68 that it lies in the block 71 in substantially axial alignment with the axis of the workholder W, to have the 'i' longitudinal axis through the shaft 36 and that through the arm 81 in the same plane.

The pantograph assembly 16 has a tracer arm 86 pivotally mounted in the manner shown in the foregoing application and Patent No. 2,481,658 and carries at the end thereof a stylus 87 which may be pressure-guided by the knob 88 to direct the stylus point along the face of the indicia pattern plate 89 on the indicia holder I.

In the form as shown, the pattern plate is carried on a cross arm 90 extending from a guide block 91 which is arranged to fit slidably in the channel 1&5 and is held predeterminedly by the set screw 92. The entire channel 18 may be adjustably mounted on the transverse channel guide 93 and held in such adjustable position by the clamp arm 94 carrying the set screw 95.

The cross arm 90 has a boss 96 serving as a trunnion for the bearing 97 axially positioned in the indicia plate S9, a screw fed turnknob 98 holding the indicia plate 89 revolubly mounted on the boss 96, The pattern plate 89 is peripherally formed with locking notches 99 axially positioned with the center of each of the indicium 100. A pawl 101, having a lever handle 102, is spring urged by the spring 103 to direct the tooth 104 in any of the selected notches 99, thereby to permit any of the indicium to be brought into position opposite the tooth 104. The tooth 104 is located to center the same in the plane common to the plane through the pivot 15 and the center of the workholder W. It will be understood that while the indicia plate may be rotated with relation to the pawl 101, to select any of the indicia for guiding the stylus 87 therein, a single master letter may be assembled in the slot 18, as circumstances may require, for engraving.

By the construction illustrated, having an aligned relationship of the pantographic pivot support in a plane common to the axis through the workholder, with relation to which the indicia plate is equally aligned, a true repro-duction of the pattern letter may be engraved upon the inner surface of the annulae, such as a finger ring R, shown on the workholder and held by the indexing chuck by coordinating the tracer arm and engraving arm in the manner employed by the assembly with at objects, or on the exterior surface of curved objects. As an indicium has been engraved on the inner surface of the annulus or linger ring, the pressure on the knob 69 is released and the stylus removed. Thereupon indexing is effected by pressing the knob 53 to rotate the indexing chuck to a new position. The relationship of the ratchet wheel 38 and the teeth thereof is so calculated to the spacing between the notches 99 that a predetermined spacing of the letters engraved on the work is achieved. It will be understood that by changing the eccentricity of the stud 50, a different relationship may be secured, in accordance with the throw which is permitted to be given to the tooth 44 and, likewise, it will be understood that the spacing may be determined by the number of teeth which have been shifted by the indexing lever arm 41.

By the construction described, pantographic installations may be readily converted to engraving rings and like annulae on the interior surface thereof.

It will be understood that while I may use a hand engraving tool 84 to carry out the engraving operation, in that the alignment of the arm 81 in the plane of the pantographic support and workholder indexing axis permits of a high degree of accuracy in reproduction, it will be understood that motorized means may be used to drive the engraving tool. Likewise, a variation in the relative position of the indicia plate to the plane common to the support for the pantographic assembly and indexing chuck may be utilized to produce an alteration in the outline of the indicia transposed from the pattern plate to the work.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is:

In an engraving machine or the like having a base, a workholder and a copyholder combined with a pantographic tracer arm and engraving tool assembly, said assembly comprising a parallclogram linkage of a pair of inner and outer end linkage arms, and a pair of inner and outer side linkage arms, each of which is of fixed length, with the alternate arms of each pair being joined pivotally to each other by pivot means and bearing means, respectively, to join the parallclogram linkage in a parallelogram of fixed length members, extensions on each of the end linkage arms, one of which carries an engraving tool, the other extension having pivot support means to one side of the parallclogram linkage, said last pivot supporting means including a fixed length tracer arm, a pantograph supporting extension arm movably connected to one of said side linkage arms at one end of said extension arm, and pivot means for the assembly at the other end of said extension arm, a mount for said pivot means, guide means for said mount and means for supporting the assembly and work for relative movement to and from each other to direct the engraving tool carried thereby to and from the work, said base comprising a web supporting table having Work holding socket means centered on si id base on a plane coincident with the central longitudinal axis of the guide means, said machine having in combination therewith a stem centered in said socket means, a ring-holding chuck mounted on said stem and rotatable about a second `axis normal to the axis of said socket means, and means for indexing said ring-holding chuck about said second axis.

References Cited in the le of this patent UNITED STATES PATENTS Butler-Jones Mar. 21, Marsilius Aug. 24, Gruettner July 31, Makishima Aug. 28, Green Feb. 10, Garing Mar. 24, Garing Dec. l,

FOREIGN PATENTS Great Britain Nov. 11, 

